Questions and assignments on subject « Constructional materials and heat treatment» at 2014-2015 academic year 1 страница

Questions and assignments on subject «Constructional materials and heat treatment» at 2014-2015 academic year

Specialized field 5В072400 - Mechanical engineering

Language - English

Term - 3, course -2, group MS - 21

Responsible for preparing of assignments – Davletiarov A. Sh.

№	Level of complexity	Questions	Themes	Answer A (correct)	Answer B	Answer C	Answer D	Answer E
1.		What kind of alloy is formed at separate crystallization of several components?		Mechanical mix	Mass compound	Chemical compound	Molecular compound	Physical compound
2.		What kind of alloy is formed when each crystal of an alloy is under construction by the atoms of both substances?		Firm solution	Mechanical mix	Mass compound	Chemical compound	Molecular compound
3.		As a result of the joint crystallization of several elements the following types of alloys can be formed: mechanical mix, firm solution and …?		Chemical compound	Firm solution	Mechanical mix	Mass compound	Molecular compound
4.		An ability of the material to maintain internal tension arising under the influence of external loading?		Durability	Plasticity	Fragility	Elasticity	Hardness
5.		How named a chemical compound of iron with carbon?		Ferrite	Cement carbide	Austenite	Pearlite	Ledeburite
6.		An ability of the material not to change the form under the influence of loading to certain limit after which occurs material destruction?		Fragility	Hardness	Durability	Plasticity	Density
7.		What kind of product can be formed as a result of electrochemical corrosion?		Rusts	Oxides	Alkalis	Sulfides	Gases
8.		How called a mass of substance in the unit of volume?		Density	Plasticity	Fragility	Durability	Hardness
9.		An ability of the material to change the form under influence of external loading and restore it after loading removal?		Elasticity	Hardness	Durability	Plasticity	Fragility
10.		An ability of the material to change the form under influence of external loading and not to restore it after removal of this loading?		Plasticity	Density	Fragility	Durability	Hardness
11.		An ability of the material to fill a casting mold in the melted condition?		Castability	Weldability	Machinability	Malleability	Fragility
12.		An ability of the material to give in to processing by cutting tools?		Machinability	Castability	Weldability	Malleability	Fragility
13.		What kind of alloy is formed when atoms of one of components partially replace atoms of another component in knots of its crystal lattice?		Firm solution of replacement	Mechanical mix	Firm solution of introduction	Chemical compound	Molecular compound
14.		How called the spontaneous destruction of metal occurring under influence of environment?		Corrosion	Solubility	Castability	Fragility	Crystallization
15.		How called a non ferrous metals whose melting point is lower than that of iron?		Fusible	Noble	Rare	Refractory	Heavy
16.		What density have the light non ferrous metals? (g/sm3)		5	2	4	3	0,5
17.		What density have the heavi non ferrous metals? (g/sm3)		5	4	0,5	3	2
18.		How called a non ferrous metals whose melting point is higher than that of iron?		Refractory	Fusible	Noble	Rare	Heavy
19.		By what the letter is denoted a polymorphic modification, which is stable at lower temperatures?
20.		How named the firm solution of introduction of carbon and other elements in iron?		Ferrite	Cement carbide	Austenite	Pearlite	Ledeburite
21.		How named a firm solution of carbon in iron?		Austenite	Ferrite	Cement carbide	Pearlite	Ledeburite
22.		How named a mechanical mix of ferrite and cement carbide, containing 0,8% of carbon?		Pearlite	Austenite	Ferrite	Cement carbide	Ledeburite
23.		How named a mechanical mix of austenite and cement carbide containing 4,3% of carbon?		Ledeburite	Pearlite	Austenite	Ferrite	Cement carbide
24.		What structural component of the iron-carbon alloy is formed as a result of eutectic transformation at temperature		Ledeburite	Pearlite	Austenite	Ferrite	Cement carbide
25.		How called an ability of the materials to resist to introduction of other firmer material?		Hardness	Plasticity	Density	Fragility	Durability
26.		How called an ability of the materials to give in to processing by pressure without destruction?		Malleability	Castability	Machinability	Weldability	Durability
27.		To what kind of coverings belongs the enamels?		Nonmetallic	Metallic	Created by chemical processing	Oxide	Salt
28.		An ability of the materials to maintain an abrasive loadings action a long time?		Wear resistance	Hardness	Fragility	Durability	Plasticity
29.		How mach % of carbon is contained in technical pure iron?		0,025	0,03	0,35	0,040	0,045
30.		How mach group cast iron are divided depending on condition of the carbon?
31.		How mach forms of inclusions of graphite are exist in the cast iron?
32.		What is the melting temperature of cement carbide?
33.		How mach % of heat transfer to the metal in martin furnace by convection?		5…10	10…15	1…2	20…25	30…40
34.		What capacity can reach the martin furnaces?		900t	700t	800t	600t	1000t
35.		What capacity can achieve the modern oxygen converters?		300t	400t	200t	50t	150t
36.		What is the temperature of melting of iron?
37.		What element considerably increases durability of steel without lowering its plasticity?		Manganese	Silicon	Carbon	Oxygen	Nitrogen
38.		The content of which elements in steel is strictly limited?		P, S	Si, Mn	Ti, W	O, N	Al, Ta
39.		At what temperature iron has the volume aligned cubic lattice?
40.		How mach % of heat transfer to metal in martin furnace by emission?
41.		What marks of steel are applied for manufacturing of details, working under intensive wear conditions?		12ХН3А, 20ХН3А	15Х2Н4МА, 18Х2Н4ВА	18ХГТ, 30ХГТ	25ХГТ, 20ХВГ	35ХС, 25Г2С
42.		How called an event when physical and mechanical properties of crystal depend on direction?		Anisotropy	Defect	Agglomeration	Recrystallization	Crystallization
43.		How mach % of carbon is contained in the cast iron?		2,14	2,24	2,34	2,54	2,44
44.		How designated polymorphic updating of iron which exists in the range of temperatures 1392…1539		-iron	-iron	-iron	-iron	-iron
45.		Name the elements which negatively influence properties of the steel		O,N, H	Mn, Ca, C	Ni, Si	V, Ta	Ti, Mo
46.		What marks of complex alloyed and economically alloyed steel are applied to production of details, working in the condition of intensive wear at raised loadings (cogwheels, piston fingers, axis ets.)		12XH3A, 20XH3A	15X2H4MA, 18X2H4BA	18XГТ, 30ХГТ	25ХГТ, 20ХВГ	35ХС, 25Г2С
47.		What elements of alloyed steel are consider as useful impurity?		Si, Mn	P, S	O, H	Ar, Ne	Cl, Ge
48.		How mach % of alloying elements contain the machine building cemented alloyed steel?		0,2…4,4	0,1…0,2	4,5…6,2	6,0…7,8	8…10
49.		How designated polymorphic updating of iron, which exists in the range of temperatures 910… ?		-iron	-iron	-iron	-iron	-iron
50.		What marks of steel are applied for manufacturing steel framework?		35XC, 25Г2С	14Г, 19Г	20ХВГ	30ХГТ, 25ХГТ	Ст35, Ст50
51.		Name the harmful impurity of steel		P, S	Si, Ni	Mn, Co	C, B	V, Ti
52.		What is the melting temperature of carbon?
53.		What part of steel are melted in the martin furnaces?
54.		What is the volume of martin furnaces		900t	800t	700t	600t	500t
55.		What impurity reduces plasticity and viscosity of steel, increases her tendency to formation of cracks at low temperatures?		P	Ni	B	N	W
56.		What angle has diamond cone, using for defining of hardness by Rockwell-s method?
57.		What part of steel are melted in oxygen converters?		30%	40%	50%	60%	70%
58.		What is diameter of a ball, that using at measuring of hardness by Rockwell-s method?		1,59	1,58	2,00	2,10	2,20
59.		What angle at top has the pyramid, using for defining of hardness by Vhickers-s method?
60.		What is formed at re-crystallization (disintegration) of austenite at temperature		Pearlite	Austenite	Ferrite	Cement carbide	Ledeburite
61.		What element is promotes workability increase cast iron cutting, gives them antifrictional properties at a friction and extinguishes influence of vibration and blows?		C	N	P	Si	Mn
62.		What is the greatest volume of the oxygen converters?		300t	100t	150t	250t	200t
63.		What brands of pearlite cast iron use for production of the wear-resistant details, maintained at big loadings: pistons, cylinders, blocks of engines		СЧ20, СЧ25	СЧ10, СЧ15	СЧ35, СЧ40	СЧ45	КЧ33-8б ВЧ100
64.		What form of graphite is obtained by annealing white iron for manufacturing malleable cast iron?		Temper	Cement carbide	Lamellar	Spherical	Vermikular
65.		What marks of steel are applied for production cogwheels, piston fingers, axis of aircraft engines?		18X2H4MA, 18X2H4BA	35XC, 25Г2С	18ХГТ, 30ХГТ	25ХГТ, 20ХВГ	40Х, 60Л
66.		About what % of all melted cast iron belongs to foundry?
67.		How called cast iron in which the main amount of carbon (more than 0,8 %) is in a look cement carbide?		Molted iron	White cast iron	Gray cast iron	Chilled cast iron	Ductile cast iron
68.		How mach %of steel are melted in eleсtro- furnace?
69.		How called cast iron in which all carbon or its most part is in a free condition in the form of lamellar graphite?		Gray cast iron	Molted iron	White cast iron	Chilled cast iron	Ductile cast iron
70.		What is the diameter of the ball for testing the hardness by Brinnel-s method?		2,5mm	3,0mm	3,5mm	4,0mm	4,5mm
71.		How called cast iron which is turning out from white by annealing at which carbon passes to a free condition in the form of temper graphite?		Malleable cast iron	High strength cast iron	White cast iron	Gray cast iron	Chilled cast iron
72.		From what cast iron is manufactured the such responsible details as cranked shaft, cogwheels, cylinders?		High strength cast iron	Malleable cast iron	White cast iron	Gray cast iron	Chilled cast iron
73.		What of suggested rules is used for defining of hardness by Brinnel-s method?
74.		Name the element, which is obstacle for graphitization of cast iron?		Mn	Mg	Si	S	P
75.		What kind of cast iron are applied to manufacturing of small and average thin walled casting of the responsible appointment working in the conditions of dynamic sign variable loadings (a detail of driving mechanisms, transmissions, brake shoes, gear wheels)		Malleable	Wear resistant	Heat resistant	Corrosion resistant	Bearing
76.		Haw called cast iron in which the bulk of metal has structure of gray cast iron and superficial layer white?-		Chilled cast iron	High strength cast iron	Malleable cast iron	White cast iron	Gray cast iron
77.		The figure 20 in brand СЧ20 means the limit of durability under…?		Stretching	Squeezing	Bending	Shifting	Turning
78.		What rind of technological test are conducted with the purpose of definition of ability of the metal to change its form?		Test at subsidence	Test at bending	Test at welding	Test at stamping	Test at stretching
79.		How called cast iron in which graphite has a spherical form?		High strength cast iron	Malleable cast iron	White cast iron	Gray cast iron	Chilled cast iron
80.		How called cast iron in which all carbon is in the connected condition?		White cast iron	High strength cast iron	Malleable cast iron	Gray cast iron	Chilled cast iron
81.		Name the element which don-t influence at graphitization of cast iron?		P	S	Si	Mg	Mn
82.		What kind of technological tests are conducted for definition of ability of the metal to cold punching and stretching?		Test at stamping	Test at stretching	Test at subsidence	Test at bending	Test at welding
83.		The figure 40 in the brand 40X2K4A means a content of …?		Carbon	Chromium	Cobalt	Nitrogen	Nickel
84.		High-quality steel is contained of S no more than …%		0,035	0,025	0,045	0,055	0,065
85.		The content of phosphorus in plane- quality steel is no more …%		0.07	0,06	0,05	0,04	0,03
86.		What % from all production of cast iron belongs to steel melting?
87.		In what aggregates is melted the cast iron?		Blast furnaces	Oxygen converters	Electro furnaces	Martin furnaces	Domain furnaces
88.		Received by metallurgical production cast iron subdivide on: -steel making iron, -special iron (ferroalloys), -and…?		Foundry	Furnace gases	Domain gases	Furnace slag	Domain slag
89.		How called the steel melting aggregates in which transfer of heat occur by radiation?		Martin furnaces	Blast furnaces	Oxygen converters	Electro furnaces	Domain furnaces
90.		How marked modified cast iron, receiving by addition before a casting in liquid gray cast iron of additives ferrosilicum?		СЧ35, СЧ40	СЧ10, СЧ15	КЧ33-8, КЧ40	СЧ20, СЧ25	ВЧ100
91.		What form of graphite in cast iron is obtained by modifying melt with Mg, Ca and other rare-earth metals?		Spherical	Cement carbide	Lamellar	Temper	Vermicular
92.		By modifying melted cast iron what elements there can be obtained spherical graphite?		Mg, Ca	Ni, Co	Mo, B	Ti, V	Si, Sb
93.		How mach % of carbon are consist the middle carbon steel?		0,2…0,45	0,45…0,70	0,70…0,95	0,95…1,20	1,20…1,45
94.		Where is the heat transfer to metal generally by emission (about 90%from all transferred heat)?		Martin furnaces	Electric furnaces	Oxygen converters	Induction furnaces	Arc furnaces
95.		How called cast iron in which the main amount of carbon (more than 0,8%)is in a look cement carbide?		Molted	White	Gray	Chilled	Ductile
96.		What % of all melted cast iron is sent on machine building plants as foundry iron?
97.		By what elements alloyed the wear resistant cast iron which used for manufacturing of the details working in abrasive environments?		Ni, Cr	B, W	Si, Ti	P, S	Mn, Ta
98.		To what group of cast iron the brands СЧ20, СЧ25 are belong?		Pearlite	Modified	High-strength	Malleable	Ferrite
99.		What element causes deterioration of foundry properties cast iron, increase of shrinkage, increase of tendency to a crack formation, decrease in temperature of the red-shortness of cast iron?		S	Si	Mn	Mo	Ti
100.		What % of heat is transferred by convection in martin furnaces?		5…10	1…3	3…5	10…20	20…30
101.		To what level can increase the torch temperature in martin furnaces in case of application the regenerators?
102.		What a steel melting process consists in a purge of liquid cast iron by oxygen from above through water cooled lance, lowered through a mouth?		Process in converters	Process in martin furnaces	Bessemer process	Tomasov process	Melting in electric furnaces
103.		How mach % of totall is melted in electric furnaces?
104.		What %of all melted cast iron are used entirely for steel melting?
105.		What elements are used for alloying cast iron, which used for manufacturing of the details, working in abrasive environments?		Ni, Cr	Mn, Mg	P, S	Si, Ti	B, V
106.		According to a form of inclusions of graphite cast iron divides on: - lamellar, -spherical, -temper, and…?		Vermicular	Spherical	Cement carbide	Lamellar	Temper
107.		What is the angle at top of pyramid for definition of hardness by Vhickers-s method?
108.		What elements are add in cast iron, which used for production of the details, working in the conditions of a friction without lubricant?		Ti, Cu, V	Mg, Mn	P, S	Si, Ta	B, W
109.		How mach % of carbon are consist the high alloyed steel?		0,5	0,6	0,7	0,8	0,9
110.		What elements are adding in cast iron in order to get the details as brake drams of cars, disks of coupling, sleeves of sylinders?		Ti, Cu,	Mg, Mn	P, S	Si, Ta	B, W
111.		From what kind cast iron is manufactured responsible details as cranked shaft, cogwheels?		High strength cast iron	Malleable cast iron	White cast iron	Gray cast iron	Chilled cast iron
112.		How mach % of alloyed elements are consist the middle alloyed steel?		2,5…7	10…15	15…20.5	20,5…25	25…32
113.		What kind of cast iron is used for manufacturing of details of driving mechanisms, transmissions, brake shoes, gear wheels, naves and etc?		Malleable cast iron	Wear resistant cast iron	Corrosion resistant cast iron	Bearing cast iron	Heat resisting cast iron
114.		What% of addition consist the high alloyed steel? (more than)
115.		To what group of cast iron belong the brands СЧ35, СЧ40?		Modified cast iron	Pearlite cast iron	Ledeburite cast iron	Ferrite cast iron	Austenite cast iron
116.		What kind of cast iron is used for manufacturing of the low responsible, not loaded details of cars?		Pearlite cast	Modified cast	Ledeburite cast iron	Ferrite cast iron	Austenite cast iron
117.		Under what kind of deformation in brand СЧ20 the figure 20 means the durability of material?		Stretching	Squeezing	Bending	Shifting	Turning
118.		What is the diameter of the ball for testing the hardness by Brinnel-s method? (10mm, 5mm, and…)		2,5mm	3,0mm	3,5mm	4,0mm	4,5mm
119.		What kind of cast iron has following advantages: high fluidity, small casting shrinkage, easy to process cutting, good antifriction properties, well extinguishes vibrations and resonant fluctuations?		White cast iron	Gray cast iron	High strength cast iron	Malleable cast iron	Chilled cast iron
120.		Name the letter, which used for designated of nitrogen in the brands of steel?		A	B	D	H	V
121.		How called steels in the annealing condition, having the structure consisting of a pearlite?		Eutectoid	Supereutectoid	Proeutectoid	Ledeburitic	Austenitic
122.		What steels are deoxidized with only manganese?		Rimming steel	Killed steel	Semi-killed steel	Semi-rimming steel	Melted steel
123.		What brands of steel are apply for manufacturing tool for fair processing of metals (broaching, scraping tool, saws on metal and cutters for processing of firm metals by cutting)?		ХВ4	7ХФ	Р12, Р18	У7, У8	Р18Ф2, Р18Ф4
124.		At what content the silicon is considered as alloying element in the steel?		0,8	0,5	1,5	2,0	2,3
125.		Name the letter, which is used for designation of chrome in the brands of steel?		Х	А	Р	В	Н
126.		To what group belongs the improved steel?		Construction-designs	Corrosion proof	Tool steel	Steel of special purpose	Automatic
127.		How called the steel, which contains to 0,035% of sulfur and 0,035% of phosphorus?		Qualitative	Low quality	Ordinary quality	Especially high quality	High quality
128.		What marks of quick cutting steels belong to group with the increased productivity?		Р14Ф4	Р12	Р18	Р6М5	Р9Ф5
129.		What % is the content of carbon in the high carbon steel?		0,50	0,20	0,25	0,30	0,35
130.		Name the letter, which is used for designation of manganese in the brands of steel?		Г	М	С	В	Н
131.		How called the steel, in the annealing condition, in which structure there are the secondary carbides which are allocating from austenite?		Supereutectoid	Eutectoid	Proeutectoid	Ledeburitic	Austenitic
132.		What steels are deoxidized partially in the melting furnace and in a ladle and final in a mold?		Semi-killed steel	Rimming steel	Killed steel	Semi-rimming steel	Melted steel
133.		What marks of steel are apply for manufacturing springs and membranes?		42НХТЮ, 17ХНГТ	12ХН3А	38ХМЮА	ХВГ, 9ХС	Р6М3, Р6М5
134.		At what content the manganese is considered as alloying element in the steel?		1,0	0,5	1,5	2,0	2,3
135.		To what group belongs the corrosion-proof steel?		Of a special purpose	Of construction designs	Tool steel	Ordinary quality steel	The automatic
136.		How called the steel which contains to 0,015% of sulfur and to 0,025% of phosphorus?		Especially high quality	Qualitative	Low quality	Ordinary quality	High quality
137.		What marcs of quick cutting steels belong to group with the normal productivity?		Р6М5	Р14Ф4	Р12	Р18	Р9Ф5
138.		Name the letter, which is used for designation of niobium in the brands of steel?		B	A	M	C	H
139.		How called the steel in the annealed condition, having in structure superfluous ferrite?		Proeutectoid	Supereutectoid	Eutectoid	Ledeburitic	Austenitic
140.		What brands of carbonaceous steel are apply for cutting tool, using for processing of materials of low hardness with small speeds?		У7…У13	7ХФ	Р18,Р12	ХВ4	Р18Ф2, Р14Ф4
141.		What brands of steel are applied for manufacturing the tool, working with shock loadings – chisels, punches and gouge?		7ХФ	У7…У13	Р18,Р12	ХВ4	Р18Ф2, Р14Ф4
142.		What letter is designated the copper in brands of steel?		Д	М	Г	Р	Ф
143.		To what group belongs the heat resisting steel?		Of a special purpose	Of construction designs	Tool steel	Ordinary quality steel	The automatic
144.		How called the steel which contains to 0,025% of sulfur and to 0,025% of phosphorus?		High quality	Especially high quality	Qualitative	Low quality	Ordinary quality
145.		What steels are apply in mechanical engineering to manufacturing by punching of details of cars, cases and casings?		Carbonaceous qualitative steel	Carbonaceous tool steel	Carbonaceous steel of ordinary quality	Carbonaceous steel of special purpose	Steel with special purpose
146.		Name the letter, which is used for designation of vanadium in the brands of steel?		Ф	Д	М	Г	Р
147.		What letter is added at the end of marking the high-quality alloyed steel?		A	Д	М	Г	Р
148.		What steel are deoxidized with manganese, aluminum and silicon in the melting furnace and a ladle?		Killed steel	Semi-killed steel	Rimming steel	Semi-rimming steel	Melted steel
149.		What steels are intended for manufacturing of products of mass production?		Carbonaceous steel of special purpose	Carbonaceous qualitative steel	Carbonaceous tool steel	Carbonaceous steel of ordinary quality	Steel with special purpose
150.		Name the letter, which is used for designation of tungsten in the brands of steel?		B	Ф	Д	М	Г
151.		How called the steel in the annealing condition, which structure contains primary carbides?		Ledeburitic	Proeutectoid	Supereutectoid	Eutectoid	Austenitic
152.		What steel are deoxidized only with manganese?		Rimming steel	Killed steel	Semi-killed steel	Semi-rimming steel	Melted steel
153.		How mach % from the general smelting of steel is belong to carbonaceous steel?
154.		To what group belongs the carburizing steel?		Of construction designs	Of a special purpose	Tool steel	Ordinary quality steel	The automatic
155.		How called the steel which contains to 0,06% of sulfur and to 0,07% of phosphorus?		Ordinary quality	High quality	Especially high quality	Qualitative	Low quality
156.		What brands of steel are apply for manufacturing of the measuring tool?		Х, ХВГ, ХГ,	Р18, Р12, Р9	У7, У8, У10	7Н, 7ХФ, ХВ4	Р6М5, Р6М3
157.		In what limits put nickel in the alloyed steel? (%)		1,0…5,0	0,5…1,0	5…7	8…12	12…20
158.		What brands of steel are apply to production of fittings usual and previously the strained ferroconcrete dуsigns?		35ХС, 25Г2С	15Х, 20Х	Х, ХВГ	14Г, 19Г	Р18Ф2, Р18Ф5
159.		What group the complex alloyed, medium-carbon steel after low annealing and thermo-mechanical processing is belong to?		Maraging high-resistance steel	Machine building improved steel	Wear resistant constructional steel	Spring steel	Low alloyed steel
160.		What means the index “сп”, standing to the right of brand of the steel?		Killed steel	Semi-killed steel	Rimming steel	Semi-rimming steel	Melted steel
161.		Steels of what group have the guaranteed mechanical properties and a chemical composition and widely applied to production of welded and other designs?		B	A	Д	М	Г
162.		What quantity in % of vanadium is used for alloying of the steel?		0,3	0,2	0,1	0,4	0,5
163.		What steel is used for manufacturing of the tool, working at a temperatures to 200…		Low alloyed steel	Cemented alloyed steel	Improved steel	Maraging high-resistance steel	Heat resistant steel
164.		The steel of what brands are apply for surgical tools?		3Х13, 4Х13	Х25Т, Х28	40Х9С2, 10Х13СЮ	Х17, Х30Т	35ХС, 25Г2С
165.		What elements are introduce in the steel with the purpose of promotion grain crashing?		Mo, W	Ni, V	Si, Mn	N, No	B, S
166.		What element is raises a threshold of cold brittleness when added in steel at quantity more than 1%?		Si	Ni	Mo	Ta	W
167.		How mach group the alloyed steels can be divided to?
168.		What steel usually apply for production of the loaded details, testing sign-variable and shock loadings?		Machine-building cemented alloyed steel	Machine-building improved steel	Machine-building high resistance steel	Spring steel	Low alloyed steel
169.		Name the marks of economically alloyed steel?		18ХГТ, 30ХГТ	12ХН3А, 20ХН3А	15ХФ, 15Х	Р18Ф2, Р18К5Ф2	35ХС, 25С23Г2
170.		What means the index “кп”, standing to the right of brand of the steel?		Rimming steel	Killed steel	Semi-killed steel	Semi-rimming steel	Melted steel
171.		What steels are apply to manufacturing of details and the devices, working under pressure?		Boiler steels	Automatic steels	Tool steel	Carbonaceous qualitative steel	Ordinary quality steel
172.		What % chromium is a rational content in alloyed steel?		2,0	0,5	1,5	1,0	2,5
173.		The steel of what brands are apply to production of the oil pipelines?		14Г, 19Г	35ХС, 25Г2С	15Х, 20Х	Х, ХВГ	Р18Ф2, Р18Ф5
174.		From what marks of steel are produced the medium loaded details of cars and mechanisms, industrial equipment?		30Х, 40Х	18ХГТ, 20ХГТ	18Х2Н4МА, 18Х2Н4ВА	12ХН3А, 20ХН3А	15ХФ, 20Х
175.		The steels what group with guaranteed mechanical properties are delivered in the annealed condition without hot processing?		А	В	Б	Г	Д
176.		What steel group united the killed, semi-killed and rimming steels?		Carbonaceous qualitative steel	Carbonaceous steel of special purpose	Carbonaceous tool steel	Carbonaceous steel of ordinary quality	Steel with special purpose
177.		In what limits in % is used tungsten for alloying of steel?		0,8…1,2	0,2…0,4	0,4…0,6	0,6…0,8	1,2…1,6
178.		What steel is slow heated and warm up at 480… in the environment preventing their oxidation and decarburization under quenching?		Quick cutting steel	Low alloyed	Cemented alloyed steel	Improved steel	High resistant steel
179.		What kind of details are subjected superficial cold working?		Springs	Small details, operated at average loadings	Details, testing sign-variable loadings	Piston fingers, axes	Responsible details of mass production
180.		For what purpose the tools from quick cutting steel are applied?		For cutting of high-strength and hardly processed materials	For processing cast iron	For cutting details from aluminum	For processing alloyed steel	For processing low alloyed steel
181.		In what range of alloying elements in % contain the machine-building cemented alloyed steel?		0,2…4,4	0,5…0,95	1,1…1,85	5,4…7,8	8,2…9.4
182.

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